It is often heard that white skin becomes black with mustard oil . But is it really so ? Science says no . Mustard oil, rich in omega alpha 3 , omega alpha 6 , fatty acids , vitamin E and antioxidants , is extremely beneficial for skin , hair and health. Vitamin E present in mustard oil enhances skin radiance and retains youth. So using mustard oil makes the skin black , such an idea is completely wrong.